elastic tissue


Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia, Wikipedia.
Related to elastic tissue: adipose tissue, Elastic connective tissue

tissue

 [tish´u]
a group or layer of similarly specialized cells that together perform certain special functions.
adenoid tissue lymphoid tissue.
adipose tissue connective tissue made of fat cells in a meshwork of areolar tissue.
areolar tissue connective tissue made up largely of interlacing fibers.
bony tissue osseous tissue.
brown adipose tissue (brown fat tissue) brown fat.
bursa-equivalent tissue (bursal equivalent tissue) a hypothesized lymphoid tissue in nonavian vertebrates including human beings, equivalent to the bursa of Fabricius in birds: the site of B lymphocyte maturation. It now appears that B lymphocyte maturation occurs primarily in the bone marrow.
cancellous tissue the spongy tissue of bone.
cartilaginous tissue the substance of cartilage.
chordal tissue the tissue of the notochord.
chromaffin tissue a tissue composed largely of chromaffin cells, well supplied with nerves and vessels; it occurs in the adrenal medulla and also forms the paraganglia of the body.
cicatricial tissue the dense fibrous tissue forming a cicatrix, derived directly from granulation tissue; called also scar tissue.
connective tissue the tissue that binds together and is the support of the various structures of the body; see also connective tissue.
elastic tissue connective tissue made up of yellow elastic fibers, frequently massed into sheets.
endothelial tissue peculiar connective tissue lining serous and lymph spaces.
epithelial tissue a general name for tissues not derived from the mesoderm.
erectile tissue spongy tissue that expands and becomes hard when filled with blood.
fatty tissue connective tissue made of fat cells in a meshwork of areolar tissue.
fibrous tissue the common connective tissue of the body, composed of yellow or white parallel elastic and collagen fibers.
gelatinous tissue mucous tissue.
granulation tissue material formed in repair of wounds of soft tissue, consisting of connective tissue cells and ingrowing young vessels; it ultimately forms cicatrix.
gut-associated lymphoid tissue (GALT) lymphoid tissue associated with the gut, including the tonsils, Peyer's patches, lamina propria of the gastrointestinal tract, and appendix.
indifferent tissue undifferentiated embryonic tissue.
interstitial tissue connective tissue between the cellular elements of a structure.
lymphadenoid tissue tissue resembling that of lymph nodes, spleen, bone marrow, tonsils, and lymph vessels.
lymphoid tissue a latticework of reticular tissue whose interspaces contain lymphocytes.
mesenchymal tissue embryonic connective tissue composed of stellate cells and a ground substance of coagulable fluid.
mucous tissue a jellylike connective tissue, such as occurs in the umbilical cord. Called also gelatinous tissue.
muscular tissue the substance of muscle.
myeloid tissue red bone marrow.
nerve tissue (nervous tissue) the specialized tissue forming the elements of the nervous system.
osseous tissue the specialized tissue forming the bones.
reticular tissue (reticulated tissue) connective tissue composed predominantly of reticulum cells and reticular fibers.
scar tissue cicatricial tissue.
sclerous t's the cartilaginous, fibrous, and osseous tissues.
skeletal tissue the bony, ligamentous, fibrous, and cartilaginous tissue forming the skeleton and its attachments.
splenic tissue red pulp.
subcutaneous tissue the layer of loose connective tissue directly under the skin.
tissue typing identification of tissue types for purposes of predicting acceptance or rejection of grafts and transplants. The process and purposes of tissue typing are essentially the same as for blood typing. The major difference lies in the kinds of antigens being evaluated. The acceptance of allografts depends on the hla antigens (HLA); if the donor and recipient are not HLA identical, the allograft is rejected, sometimes within minutes. The HLA genes are located in the major histocompatibility complex, a region on the short arm of chromosome 6, and are involved in cell-cell interaction, immune response, organ transplantation, development of cancer, and susceptibility to disease. There are five genetic loci, designated HLA-A, HLA-B, HLA-C, HLA-D, and HLA-DR. At each locus, there can be any of several different alleles.



Each person inherits one chromosome 6 from the mother and one from the father; that is, each parent transmits to the child one allele for each kind of antigen (A, B, C, D, and DR). If the parents are different at both alleles of a locus, the statistical chance of one sibling being identical to another is one in four (25 per cent), the chance of being identical at one allele only (half-identical) is 50 per cent, and the chance of a total mismatch is 25 per cent.
Techniques for Tissue Typing. Histocompatibility testing involves several basic methods of assay for HLA differences. The most widely used method uses the polymerase chain reaction to compare the DNA of the person, organ, or graft being tested with known pieces of the genes encoding MHC antigens. The variability of these regions of the genes determines the tissue type of the subject.



Serologic methods are used to detect serologically defined antigens on the surfaces of cells. In general, HLA-A, -B, and -C determinants are primarily measured by serologic techniques. A second method, involving lymphocyte reactivity in a mixed lymphocyte culture, for determining HLA-D or lymphocyte-defined antigens, is now only rarely used.

Essentially, the serologic method is performed by incubating target lymphocytes (isolated from fresh peripheral blood) with antisera that recognize all known HLA antigens. The cells are spread in a tray with microscopic wells containing various kinds of antisera and are incubated for 30 minutes, followed by an additional 60-minute complement incubation. If the lymphocytes have on their surfaces antigens recognized by the antibodies in the antiserum, the lymphocytes are lysed. A dye is added to show changes in the permeability of the cell membrane and cellular death. The proportion of cells destroyed by lysis indicates the degree of histologic incompatibility. If, for example, the lymphocytes from a person being tested for HLA-A3 are destroyed in a well containing antisera for HLA-A3, the test is positive for this antigen group.
white adipose tissue (yellow adipose tissue) the adipose tissue composing the bulk of the body fat.

e·las·tic tis·sue

a form of connective tissue in which the elastic fibers predominate; it constitutes the ligamenta flava of the vertebrae and the ligamentum nuchae, especially of quadrupeds; it occurs also in the walls of the arteries and of the bronchial tree, and connects the cartilages of the larynx.
Synonym(s): elastica (2) , tela elastica

elastic tissue

n.
A type of connective tissue consisting mainly of elastic fibers and found in the walls of arteries, dermis of the skin, and certain ligaments and tendons.

e·las·tic tis·sue

(ĕ-las'tik tish'ū)
A form of connective tissue in which the elastic fibers predominate; it constitutes the ligamenta flava of the vertebrae and the ligamentum nuchae, especially of quadrupeds; it occurs also in the walls of the arteries and of the bronchial tree, and connects the cartilages of the larynx.
References in periodicals archive ?
While both MDE and anetoderma are considered acquired elastolytic disorders [1], both diseases have different cellular origins leading to the degradation of elastic tissue. Reactive fibroblasts seem to contribute to an MMP-2 rich dermal microenviroment and do not seem to involve MMP-9 secretion in anetoderma.
Wood, "Wrinkles due to idiopathic loss of mid-dermal elastic tissue," British Journal of Dermatology, vol.
The classic histologic picture with pseudoxanthoma elasticum skin lesions is fragmentation and clumping of elastic tissue evident on Verhoeff-van Gieson stain, and calcification on yon Kossa stain.
The staining currently automated are: Massons~s trichrome (or Gomori~s trichrome), Grocott~s Methenamine Silver (or Gomori~s Methenamine Silver), Giemsa, Gordon and Sweet (or Gomori and Snook), Congo Red, Jones Methenamine Silver (with H&E contrast colour), Gram, PAS + diastase (2 kit), Perls Prussian Blue, Alcian Blue (pH 2,5), Ziehl-Neelsen, Elastin (Modified Weigert~s Resorcin Fuchsin, Verhoeff~s elastic tissue).
Pseudoxanthoma elasticum (PXE) is a rare condition characterized by generalized fragmentation and progressive calcification of elastic tissue in the dermis, blood vessels and Bruch's membrane of the eye.1 This leads to laxity of the skin, arterial insufficiency and retinal hemorrhage.
"Incontinence starts with the bladder, which holds the urine until it is released from the dog's body," he says, "and usually involves the urethral sphincters, which make up the urethra's closure system." There are two kinds of urethral sphincters, rings of elastic tissue that tighten or loosen as needed in order to prevent or allow the flow of urine from the bladder.
They were stained with hematoxylin and eosin for general tissue morphology as well as Gormori's aldehyde fuchsin for elastic tissue and Lillie's ferrous iron for melanin.
The MCA is a muscular artery and muscular arteries generally have the same basic composition as elastic arteries but the elastic tissue is reduced to a well-defined, fenestrated elastic sheet, the internal elastic lamina, in the tunica intima, and a diffuse external elastic lamina in the tunica adventitia.
An elastin stain of the papillae demonstrated a central, loosely lamellated elastic tissue core with tapering rudimentary elastin fibers located toward the periphery (Figure 3).
It's believed that smoking may release an enzyme that breaks down collagen and essential elastic tissue and may also restrict blood supply to the skin.
Some suspect that the lungs of fetuses whose mothers smoke, like those of fetal rats in laboratory tests, weigh less and produce less elastin (the main protein of the lung's elastic tissue fibers), thus decreasing pulmonary function.
Serial sections were obtained at 5[micro]m thickness from a rotary microtome and subjected to the following staining procedures: heamatoxylin and eosin (H&E), Van Gieson and Verhoeff's heamatoxylin elastic tissue stain.